1537results about "Surface mining" patented technology

The invention provides a rock burst and mine earthquake collaborative treatment method based on regional fracturing, and the method comprises the following steps: selecting a working surface, determining a plurality of rock burst control layers with rock burst risks, then determining a plurality of mine earthquake control layers with mine earthquake risks, and determining a plurality of mine earthquake control layers with mine earthquake risks; performing main control layer analysis on all the rock burst control layers in the fissure zone preferentially to determine a multi-stage rock burst main control layer, performing main control layer analysis on all the mine earthquake control layers above the fissure zone to determine a multi-stage mine earthquake main control layer, and performing logging correction analysis; according to the length and width of the working face, the thickness of the rock burst control layer and the number of the mine earthquake control layers, the layout design of separate layer fracturing is determined, the treatment method achieves comprehensive prevention and control of the mine area risk, the treatment effect on the rock burst and the mine earthquake is remarkable, the disaster risk is reduced, and a powerful guarantee is provided for mine safety production.

The invention discloses a V-shaped mine collecting trench construction method for improving the stability of a roadway in an ore pillar, which comprises the following steps of: constructing a plurality of rows of upward fan-shaped blast holes along the trend of a stope, and adding an empty hole in the middle position of each of the left side hole and the right side hole in the adjacent rows of fan-shaped blast holes; the fan-shaped blast holes are filled with explosives, and newly-added empty holes are not filled with explosives; and the cutting raise is used as a blasting free surface, and the fan-shaped blast holes are detonated row by row in several times to form the V-shaped mine collecting trench. According to the method, through cracks are formed along the center connecting lines of the side holes under the guiding effect of the newly-added empty holes during fan-shaped hole blasting, cutting of the V-shaped boundary is completed, damage of fan-shaped blast hole blasting to ore pillar rock mass is reduced, and the purposes of improving the integrality of ore removal roadway surrounding rock and the stability of an ore removal roadway are achieved. The V-shaped ore collecting trench construction method is suitable for V-shaped ore collecting trench construction of a stope bottom structure of an open stope subsequent filling mining method, damage to ore pillar rock mass can be weakened in the V-shaped ore collecting trench construction process, and then the stability of an ore removal roadway is improved.

The invention discloses a section-block section-strip high-strength low-carbon mining method and system suitable for a high and cold high-altitude mining area. The method comprises the steps that a strip mine is divided into N independent mining sections in the advancing direction; on the basis of a mine multi-source multi-level three-dimensional geological refinement model, ore block sections and rock block sections are divided in each independent mining section; dividing a grade strip and a rock strip; carrying out differential process chain matching according to grade strip and rock strip division results; and dynamically updating the boundary of the strip through real-time geological data feedback, cooperatively scheduling mining equipment to execute a mining task, acquiring mining surface grade data in real time, and updating the boundary of the ore block section and the rock block section. The method has the remarkable effects that a grade feedback mechanism is designed to update the mining mode in real time, and high-strength low-carbon mining of mineral resources in the high-cold and high-altitude mining area is realized.

The invention provides a hydraulic fracturing fracture net distribution form near-field monitoring method, which comprises the following steps of: arranging a plurality of roof monitoring holes in roadways on two sides of an underground coal mine working surface, installing electromagnetic signal sensors in each roof monitoring hole and on anchor rods of roadway stoping sides, and constructing a full-space monitoring network covering a hydraulic fracturing layer; a data interpretation processing module of the electromagnetic signal time-shifting imaging analysis system comprises a multi-field coupling mathematical model for analyzing and deducing real-time imaging of electromagnetic signals; in the hydraulic fracturing process, an electromagnetic signal sensor is used for monitoring a current field, an electromagnetic field and an ion diffusion field in the rock mass fracture development and expansion process, a monitoring result is substituted into an electromagnetic signal time-shifting imaging analysis system for calculation and feature value extraction, and the fracture net distribution form is deduced through the feature value. According to the invention, the expansion path of the fracturing fluid in the rock stratum can be monitored in real time, the three-dimensional distribution form of the hydraulic fracturing fracture network can be inverted, and a new technical support is provided for the inspection of the hydraulic fracturing pressure relief effect of the underground coal mine.

The invention discloses a combined well spacing method for a ground vertical well and an underground horizontal well, which comprises the following steps of: determining estimated fracturing information of the vertical well and estimated fracturing information of the horizontal well according to acquired fracturing construction information of a surrounding mine; the width of the to-be-mined working face and the lateral mining-induced fracture range of the mined working face are obtained, vertical well construction information is determined according to the width of the to-be-mined working face, the lateral mining-induced fracture range and vertical well estimated fracturing information, fracturing construction is conducted on the thick and hard roof based on the vertical well construction information, and the vertical well fracturing range of a ground vertical well is obtained; and horizontal well construction information is determined according to the horizontal well estimated fracturing information and the vertical well fracturing range, and fracturing construction is conducted on the impact main control rock stratum based on the horizontal well construction information. According to the combined well spacing method for the ground vertical well and the underground horizontal well, the well spacing scheme that the ground vertical well and the underground horizontal well are matched with each other is adopted, sufficient fracturing and pressure relief can be conducted on a thick and hard top plate, and cooperative prevention and control over rock burst and mine earthquake disasters are achieved.

The invention relates to a deep stratum well hole and cave mining system and method, the system comprises a traffic well hole system, the traffic well hole system is provided with at least one well hole smaller than 1 m, an internal channel formed by the well hole is communicated with a cave formed by excavation, and the internal channel formed by the well hole is configured to be a flow-back channel and / or an injection channel; the well hole and cave mining device is provided with a crushing assembly and / or a cleaning and transporting assembly, the crushing assembly is used for carrying out form-controllable mining on the ore on the cave rock wall surface, and the cleaning and transporting assembly is used for cleaning ore particles in the cave or transporting the ore particles to the flowback channel; and the particle flow lifting system is used for lifting the extracted ore particles out of the well through the flow-back channel. The technical problems that when caves of deep stratums are mined, the supporting effect is poor, and the ore particle clearing and transporting efficiency is low are solved, and large-scale and high-efficiency mining operation can be conducted on the deep stratums or non-hard stratums.

The invention discloses a mining section coal pillar goaf side concrete wall reinforcing method, and relates to the field of coal mining, and the method comprises the following steps: collecting section coal pillar geological parameters; calculating a boundary position of a plastic zone according to geological parameters of the coal pillar, and dividing the coal pillar into a broken zone, a fractured zone and an original structure zone; basic roof strata are determined according to geological parameters of the coal pillar, the bearing capacity of the basic roof strata is calculated, the basic roof strata with the minimum bearing capacity serves as a roof cutting target layer, and the hydrofracture roof cutting drilling depth needed for penetrating through the target layer is determined; the broken area range serves as the influence range of surrounding rock pressure calculation, the static load q applied to the concrete wall by the surrounding rock pressure is calculated, the static load q is corrected through a dynamic load coefficient, and a supporting load Q is obtained; and according to the support load Q, reinforcement parameters are determined. Aiming at the surrounding rock deformation and instability of the adjacent roadway on the section coal pillar gob side under the deep well mining condition, the method effectively controls the surrounding rock deformation and instability of the adjacent roadway caused by working face mining disturbance.

The invention relates to the technical field of evaluation and real-time optimization systems, and discloses a deep fluidized mining dynamic disaster prevention and control effect intelligent evaluation and real-time optimization system which comprises a data acquisition module used for acquiring monitoring data in real time through a multi-source sensor network arranged in a stope, a fluidized medium and surrounding rock, and an intelligent analysis module used for analyzing the monitoring data in real time. And the construction module is used for constructing a comprehensive evaluation index system comprising a statics index, a dynamics index and a stability index based on the monitoring data. The intelligent evaluation and real-time optimization system for the dynamic disaster prevention and control effect of deep fluidized mining breaks through the limitation of traditional single index evaluation, constructs a comprehensive evaluation index system covering statics, dynamics and stability by integrating stress, microseismic, acoustic emission, displacement and other multi-source sensor networks, and improves the dynamic disaster prevention and control effect of deep fluidized mining. A deep learning model is used for carrying out fusion analysis on mass heterogeneous data, and multi-dimensional precursor information of disaster inoculation can be disclosed.

The present invention discloses a tiered liquid collection method for the in-situ mining process of ionic rare earth ores. For ionic rare earth mines with high mountains and steep slopes or large ore volumes, the method utilizes tiered divisions and liquid collection facility layouts based on geological conditions such as the area of ​​the injection mining area, topography, and rock formation occurrence. Multiple layers of leaching diversion holes, leaching collection trenches, and rainwater drainage trenches are arranged from top to bottom to collect leaching liquid and drain natural rainfall. An anti-seepage curtain is constructed along the foot of the mountain to prevent leaching liquid from overflowing and leaking. A leaching collection well with multiple layers of leaching diversion holes is installed in the liquid accumulation area inside the anti-seepage curtain to recover the leaching liquid and control the groundwater level in the accumulation area. This method can effectively control landslides, mudslides, and debris flows that are prone to occur during the injection process in mines with high mountains and steep slopes. It can also achieve tiered mining, effective leaching liquid collection, and reduced leaching agent loss in mines with large ore volumes, contributing to the establishment of a new model of ecological and green mining for sustainable development.

The invention belongs to the technical field of coal bed gas mining, and particularly discloses a multi-coal-bed mining optimization control method based on crossheading position stability, and the method comprises the steps: comprehensively obtaining parameters such as coal bed spacing, thickness, inclination angle, roof and floor lithology and fault distribution, and generating an accurate three-dimensional geologic model through three-dimensional modeling software; and the condition of incomplete geological analysis of a traditional method is changed. And on the aspect of crossheading arrangement, empirical operation is replaced with finite element analysis, the anchor rod distance and the support density are accurately determined, and safety and economical efficiency are improved. The mining sequence planning is changed from dependence on a fixed rule to establishment of an identification model combined with a genetic algorithm, and dynamic optimization is realized. The mining height, the mining width and the advancing speed are flexibly regulated and controlled according to the mapping relation table in the mining process, and real-time dynamic adjustment is achieved. Meanwhile, the early warning mechanism calculates scores based on crossheading stress data, is more accurate and sensitive, and has higher pertinence and effectiveness.

The invention relates to the technical field of mine construction, in particular to a cross-section layer large-dip-angle fully mechanized coal mining face wall caving prevention method which comprises a wall caving prevention equipment anti-skid cooperative system which is an integrated system composed of a hydraulic support, a scraper conveyor, an inclined anti-skid mechanism and an anti-skid hydraulic machine. The device is used for achieving anti-skid, anti-falling and posture cooperative adjustment of the device in the pseudo-inclined dip mining slope adjustment process. The hydraulic support is rigidly connected through the externally-arranged anti-skid hydraulic machine, the linkage influence of sliding-down of the scraper conveyor is counteracted, and the hydraulic support is prevented from toppling over; the built-in anti-skid hydraulic machine corrects the deviation of the connecting rod and protects the hydraulic support from being damaged; the anti-skidding, anti-falling and anti-caving effects of the fully-mechanized coal mining equipment in effective mining of the large-dip-angle working face are achieved through layout adjustment of the pseudo-dip dynamic adaptive fault and the fully-mechanized coal mining equipment anti-skidding system, the mining efficiency of the working face is improved, the equipment sliding-down possibility is reduced, and the technical problems existing in the large-dip-angle fully-mechanized coal mining process are solved.

The invention discloses an intelligent collaborative supporting and recycling method for residual mining of special-shaped pillars in a limited space, and belongs to the technical field of mining engineering. According to the method, an intelligent closed-loop system of sensing, decision-making, execution and feedback is constructed aiming at the problems of narrow space, complicated stress, high safety risk and the like faced by special-shaped ore pillar recovery in a limited space. The method comprises the following steps: firstly, constructing a dynamic digital twinborn model by using LiDAR and GPR fusion detection; secondly, performing stoping-supporting collaborative optimization design based on numerical simulation and an AI algorithm; then, low-disturbance blasting and micro intelligent equipment are adopted for precise subsection stoping; the mining-supporting-filling cycle operation is synchronously implemented, and an artificial key layer is quickly constructed by using a quick-setting expansion material; and finally, multi-stage intelligent early warning and dynamic regulation and control are realized through a multi-element sensor network. According to the method, the recovery rate of residual ore resources can be remarkably increased to 90% or above, ground pressure disasters are effectively controlled, and green, safe and efficient recovery of mine resources is achieved.

The medium-length hole mining method under the complex geological condition comprises the following steps that S1, a stope is divided, specifically, the stope is divided into two stages along the inclination direction of an ore body, and bottom columns are not reserved; s2) roadway construction; s3) stoping: taking the cutting raise and the transverse cutting roadway as double free surfaces, and constructing medium-length hole blasting in a retreating manner from the middle to the two ends; s4) drilling and blasting; s5) transporting the ores; and S6) ventilation and dust prevention. The method is suitable for mining inclined ore bodies with thick ore bodies, unstable IV-level surrounding rock stability, extremely unstable V-level local parts and inclination angles of 30-50 degrees. By means of the non-sill-pillar structure and the 25-m stage interval and the through ore removal access road of the outside-vein transportation roadway, 15%-20% of sill pillar resource loss in a traditional method can be eliminated, the ore recovery rate is greatly improved, dead ore resources in a mining area are activated, and the service life of a mine is prolonged.

The invention discloses a drilling and cutting head, a drilling and cutting device, a gob-side entry retaining slotting method and a roof cutting pressure relief method, and belongs to the technical field of mine drilling and cutting. The drilling and cutting head comprises a vehicle body, a drilling rod and the drilling and cutting head, and the vehicle body is rotationally provided with a drilling rod conveying driving mechanism through a connecting base and a rotary table; a water cutting system is further installed on the vehicle body. The drilling and cutting head comprises a mounting seat, a plurality of drill bit seats and drill bit blocks, an inner cavity is formed in one end of the mounting seat, and mounting holes are formed in the side wall of the mounting seat; a spray hole is formed in the middle of the spray head. And the end part of the inner cavity of the drilling and cutting head is connected with the head drill rod. Through one device, two operation procedures of drilling and water cutting can be achieved, high efficiency of the gob-side entry retaining slotting method and the top cutting pressure relief method can be achieved, the device cost is effectively reduced, the device can be flexibly and conveniently used in a roadway, the operation efficiency is effectively improved, and the device cost is reduced.

The invention discloses a deep mine rockburst risk grading early warning and active pressure relief system and method, and relates to the technical field of rockburst risk early warning. The system comprises a multi-source parameter sensing module, a risk grading early warning module, an active pressure relief execution module, an intelligent control center module and a data storage and interaction module, wherein the multi-source sensing module comprises a distributed sensor and a mobile inspection robot; risk early warning is divided into four levels, and sensitive features are extracted after data are preprocessed; active pressure relief comprises fixed-point and regional pressure relief equipment; the control center uses a redundant architecture to automatically match a pressure relief scheme; and data storage retains more than or equal to 5 years of data, and multi-system docking is supported. The rock burst early warning accuracy and the pressure relief pertinence are improved, multi-module closed-loop cooperation is achieved, emergency response is efficient, false alarm, missing alarm and pressure relief blindness are reduced, roadway stability and personnel safety are guaranteed, and support is provided for safe and efficient mining of deep mines.

The invention discloses a filling mining method based on stage reverse medium-length hole groove broaching, which relates to the technical field of mining, and comprises the following steps: stope structure parameter design, mining preparation engineering construction, cutting engineering, stoping process and filling process are carried out in sequence, the cutting project comprises the steps of cutting courtyard rapid forming, cutting groove broaching and cutting groove rapid penetrating; and the cutting courtyard is rapidly formed by adopting a laser pre-splitting auxiliary blasting process. According to the method, the cutting and groove broaching processes are deeply optimized, so that the overall efficiency of underground mining is remarkably improved. In the cutting courtyard forming stage, the laser presplitting auxiliary blasting technology is introduced, so that the rock integrity is reduced, the blasting energy is more concentrated, the effect is more accurate, the problems of perforation, rock slag squeezing and the like in the traditional process are effectively avoided, the explosive loading amount can be reduced, disturbance of blasting vibration to surrounding rock is reduced, and the blasting quality is improved. And a safer technical support is provided for high-stress ore body mining.

The invention discloses a false-inclined multi-layer strip mining method for gentle-inclined medium-thickness underground sedimentary bauxite. The method is particularly suitable for safe and efficient mining of gentle-inclined medium-thickness bauxite with an unstable top plate. An in-vein middle-section transportation roadway is arranged in an ore body to divide the ore body into different middle sections, top and bottom columns are reserved between the middle sections, mining areas are divided in the middle sections in the moving direction of the ore body, columns are reserved between the mining areas, a mining area slope ramp, a lower layered ore loading gate way, a segmented transportation gate way, a layered connection way and an upper layered cutting gate way are respectively tunneled, and strips of two specifications are arranged; the arranged mining areas, ore blocks, mining area ramps, strips and studs are all arranged in a pseudo-inclined mode, the stoping operation is divided into two steps for layered stoping, the strips of 3-5 m are firstly stoped, the strips of 6-8 m are then stoped, according to the stoping sequence that the lower layer is firstly stoped and then the upper layer is stoped, and filling is conducted in time after each layer is stoped. The method is in-vein engineering and has the advantages of being small in mining and cutting engineering amount, good in safety and economical efficiency, high in recovery efficiency and the like.

The invention discloses a mechanical wall-cutting and filling mining method for gypsum ore. Aiming at the problems of difficulty in ventilation, high labor intensity, low production efficiency, poor surrounding rock stability and the like in a traditional wall cutting filling method, the method realizes safe and efficient mining of an extremely thin ore body through mechanical ore breaking, precise separation of a photoelectric ore separator and an in-situ immediate filling process of waste rocks. The method comprises the steps of ore block parameter design, mining preparation cutting, mechanical stoping, photoelectric mineral separation, barren rock in-situ filling and goaf ground pressure management, the stope structure and process can be dynamically adjusted according to the thickness and inclination angle of an ore body, and operation accuracy and safety are guaranteed through laser monitoring and supporting measures. According to the method, the mechanization level and mining and stoping efficiency of a gypsum mine mining process are remarkably improved, manual selection operation is reduced or even canceled, the labor intensity and cost of workers are reduced, the operation environment is improved, the stability of surrounding rock is improved, the method is suitable for mining of extremely thin ore bodies and other similar ore bodies under different conditions, and a foundation is laid for mine intelligent construction.

The invention discloses a grouting and filling method for a cross-layer area of a coal pillar group in a residual mining area, and relates to the technical field of coal mining, which comprises the following steps of: (1) selecting a key layer; (2) a drill hole is constructed in the key layer, a directional initial crack is formed in the drill hole through frosted water jet cutting, then the two ends of the drill hole are set, and the initial crack is expanded to form a crack network in the mode that high-pressure fluid is injected into a hole sealing section; (3) grouting materials are adopted for conducting segmented grouting construction on the drill holes in the step (2), specifically, firstly, low-viscosity grout is used for filling a crack network formed through fracturing, then medium-viscosity grout is used for filling a coal pillar plastic area influenced by mining, and finally high-viscosity grout added with an accelerating agent is used for filling roof fractured rock mass and goaf and goaf roadways; and (4) after the slurry is solidified, a coal pillar-slurry vein body-overlying strata composite bearing structure is formed. According to the invention, the rock mass cohesive force and overall strength of the re-mining area can be obviously enhanced, and the stability of re-mining roadways and working face surrounding rocks is improved.

The invention relates to the technical field of underground mining of metal ore deposits, in particular to a staged ascending pillar-free large-diameter deep-hole lateral caving subsequent filling mining method, which comprises the following steps of: dividing a steeply inclined medium-thickness ore body into a plurality of stages, and dividing large and small stopes in the stages without leaving pillars; digging a flat-bottom ore removal structure at the bottom of the stope, and digging a rock drilling chamber at the bottom of the stope at the upper stage; digging a cutting well at the end part of the stope and expanding the cutting well into a cutting groove; large-diameter parallel deep holes are drilled downwards in the rock drilling chamber, and lateral ore caving is carried out with cutting grooves as free faces; the caved ore is transported out by a carry-scraper through the flat-bottom ore removal structure; and the stope goaf is subjected to subsequent cemented filling. The small stopes are firstly stoped and filled with the 1: 4 full-tailing cementing material, and after the small stopes are solidified, the large stopes are stoped and filled with the 1: 20 full-tailing cementing material. The method has the characteristic of ascending stoping among stages, and has the advantages that pillar-free continuous stoping is realized, and the rock drilling chamber is used as a flat bottom ore removal structure to be reused.

The invention discloses a coal mining water retention method, which comprises the following steps of: pre-calculating the height h0 of a water flowing fissure zone in a deep aquifer when the water yield Q2 of a coal mining mine is equal to the total water consumption Q1 of production and life of a mining area, and then calculating the corresponding mining height M0 when a coal seam below is mined according to the height h0 of the water flowing fissure zone; according to the mining height M0, the filling height M2 needing to be equivalently filled in the goaf is calculated, and materials are filled into the goaf behind along with advancing of the coal face during coal mining until the materials reach the height of M2, so that too high or too low development of the water flowing fissure zone can be inhibited, the filling height or thickness can be reduced, and the filling efficiency is improved. According to the method, the balance between the filling height of the goaf and the development height of the water flowing fractured zone is found in an equivalent filling mode, mine water generated during coal mining can meet the total water consumption of production and life of a mining area, the defects caused by complete filling can be avoided, the coal mining efficiency is improved, and the water retention effect is also improved.

The invention provides a downward parallel medium-length hole sublevel filling mining method for a low-grade broken ore body, belongs to the technical field of mining, and solves the problems that a traditional mining method is low in mining efficiency and high in cost under complex geological conditions. Downward parallel medium-length holes are adopted in each section for drilling and blasting, efficient stoping is achieved in cooperation with remote control ore removal and supporting equipment, an interbed filling technology is adopted in a goaf to be combined with a reinforcing mesh structure to form an artificial roof, stress and displacement changes of a filling body are monitored in real time through a ground pressure monitoring system, and the stoping sequence and supporting parameters are optimized. According to the method, the efficiency and safety problems of a traditional mining method in low-grade and broken ore deposit and three-under resource mining are solved, large-scale, low-cost, safe and efficient mining is achieved, and the method is suitable for ore body mining under complex geological conditions.

The invention discloses a key layer presplitting settlement control method based on overlying strata fracture angle arrangement. The method comprises the steps that geological mining parameters of a target mine are collected and determined; based on the physical and mechanical parameters of each rock stratum, determining the horizon height of the key stratum in combination with a thick and hard rock stratum judgment criterion; according to coal seam mining parameters and overlying strata lithology, the height of a water flowing fractured zone is judged, and high and low horizon classification is conducted on the water flowing fractured zone by combining the horizon of the key horizon; according to the development law of overlying strata damage along the fracture angle from bottom to top, the presplitting position in the horizontal direction of each layer key layer in the presplitting range is calculated and determined, and full-section directional presplitting cutting is carried out; based on thick and hard rock stratum mining-induced stress distribution characteristics and a damage deformation transmission mechanism, a working face moving boundary and a reduction distance of a building (structure) protection coal pillar after key stratum presplitting are calculated and determined. According to the method, presplitting implementation is guided based on the key layer fracture rule, and a new technical approach is provided for subsidence control of the mining area.

The invention discloses a shallow coal seam strong mine pressure dynamic early warning and cooperative control method and system based on multi-source data fusion, and relates to the technical field of intelligent control. Coal seam multi-source sensing data is collected, a strong mine pressure feature vector is constructed, and the strong mine pressure feature vector is input into a mixed model of a deep recurrent neural network and a graph neural network; outputting an energy release index and a risk probability value, judging a coal seam strong mine pressure risk level, determining a fracturing position and fracturing parameters of directional hydraulic fracturing by adopting a self-adaptive grid division algorithm when a red early warning signal is triggered, and determining a fracturing parameter of directional hydraulic fracturing by adopting a self-adaptive grid division algorithm when an orange early warning signal is triggered. The spraying area and thickness distribution of energy absorption material spraying are determined through a reinforcement learning model, when a yellow early warning signal is triggered, a supporting resistance adjusting scheme of a hydraulic support is determined through a gradient descent algorithm, risk grading control is achieved, and the accuracy and practicability of coal seam early warning are improved.

The invention discloses an underground mine goaf filling body strengthening and subsequent mining joining method, and relates to the technical field of mine mining. Comprising the following steps of intelligent filling body construction and reinforcement, multi-source fusion intelligent monitoring and digital twinning construction, data-driven subsequent mining dynamic intelligent decision making and energy regulation and control, targeted restoration and collaborative ecological reconstruction. The intelligent filling body is made of the shape memory polymer fibers and the nanometer piezoelectric ceramic particles, the layering process is combined to improve the strength and real-time state feedback, the safety and durability of the filling body are remarkably improved, the high-fidelity digital twinborn model is constructed in a fused mode, intelligent decision making and active wave absorbing regulation are linked, and the stability of the filling body is improved. The subsequent mining efficiency can be effectively improved, the damage risk of the filling body can be effectively reduced, in addition, the damage area is accurately positioned through the unmanned aerial vehicle, directional grouting repair is conducted, heavy metal is solidified through microorganisms, solid waste is recycled, the resource utilization rate in the mining process is increased, and the environmental burden is reduced.

The invention relates to the technical field of coal mining and mine safety engineering, and discloses a coal pillar stability dynamic monitoring and pressure relief control method for gob-side entry driving, which comprises the following steps: collecting multi-field coupling signals of a coal pillar, and collecting environmental data of a roadway; analyzing the stability of the coal pillar according to the multi-field coupling signal, and when an analysis result does not meet a stable condition and the environmental data does not meet an environmental condition, generating a cooperative control instruction of the high-pressure water jet system integrated with the solid-liquid waste collection device; executing directional hydraulic fracturing pressure relief operation on the coal pillar area according to the cooperative control instruction, and monitoring the stress distribution and fracture closing state of the coal pillar after pressure relief; hydraulic parameters of the high-pressure water jet system are adjusted according to the coal pillar stress distribution and the fracture closed state; and when the coal pillar recovers the stable state and the environmental data meet the environmental conditions, controlling the pressure relief operation of the coal pillar area according to the cooperative stop instruction. According to the method, the accuracy of dynamic monitoring and pressure relief control of the stability of the coal pillar of gob-side entry driving can be improved.

The invention discloses a short-distance multi-ore-bed potassic salt ore large-section long-strip comprehensive mechanized mining method, and belongs to the technical field of potassic salt ore deposit mining. The method comprises the steps that a centralized transportation roadway is arranged on an upper head mining layer, an auxiliary transportation roadway is arranged in a stable salt rock interlayer between ore layers, and combined development is achieved; arranging large-section long strip chambers in the ore blocks along the inclination direction, and reserving permanent spacing strip pillars to maintain the stope to be stable; a chamber is cut and formed at a time by a double-arm large-mining-height mining machine, and efficient stoping is realized by matching with a continuous transportation system; multiple ore beds are mined in a coordinated mode from top to bottom in sequence, and the ore block air return way and the ore block air return way of the upper ore bed are staggered by 20 m or above so as to avoid stress superposition; a full-air-pressure ventilation system combining a press-in type and a draw-out type is constructed; natural supporting is achieved through permanent spacing strip pillars and natural top and bottom plates, safety is guaranteed through a micro-seismic and top plate monitoring system, and the goaf is backfilled with tail salt slurry to achieve green mining. According to the method, safe, efficient and high-recovery-rate mining of the short-distance multi-ore-bed sylvite ore is achieved.

The invention discloses a zoned prevention and control method for damage of an underground water-preserved mining aquifer in a western ecologically fragile mining area, and relates to the technical field of coal mine water-preserved mining. The method comprises the following steps: an exploration stage: obtaining spatial distribution and physical and mechanical parameters of an aquifer, and dividing aquifer protection grades; in the planning stage, predicting the height of a water flowing fractured zone, determining mining parameters and dividing water-bearing stratum damage grades; in the mining stage, differentiated protection is carried out on the aquifer according to the aquifer protection grade and the damage grade; and a feedback stage: dynamically monitoring the water level, the height of the water flowing fractured zone and the water inflow, quantitatively evaluating the water retention effect and feeding back and optimizing mining parameters and protection measures to form a closed-loop control system. According to the method, a full-period closed-loop technical chain of exploration-planning-mining-feedback is constructed, the heterogeneity characteristics of the damage space of the aquifer are fused, a differentiation regulation and control mechanism based on damage grade zoning is established, and dual-target dynamic balance of coal resource mining and underground water system protection is achieved through space-time collaborative optimization.

The invention discloses a double-column shallow hole ore breaking two-step shrinkage subsequent filling mining method, and belongs to the technical field of underground mining. Arranging a cutting project to form a stoping space; the jambs are divided into hanging wall jambs and footwall jambs, the footwall jambs are stoped, and filling is carried out after ore removal; and the hanging side pillar is stoped. According to the scheme, the footwall pillars are firstly stoped and filled to form the supporting body, and the hanging wall pillars are stoped later, so that the exposure of the whole goaf is avoided, and the possibility of surrounding rock instability caused by recovery of the pillars in the tall and large goaf is reduced; the filling bodies replace the pillars to bear the pressure of the top plate, so that the permanent pillar remaining amount is reduced, and the recovery rate is increased; the goaf is closed in time after filling, surrounding rock movement is restrained, and therefore the problem of surface collapse is avoided; and the pillars are divided according to the positions and the rock mass stress, stoping is conducted in sequence, the stress superposition risk of synchronous stoping is reduced, and therefore the high-safety stoping method for the pillars between the ore bodies is provided.

The present application belongs to the field of phosphate mining, and particularly relates to a method for mining a steeply inclined phosphate deposit without leaving a top and bottom pillar; the method comprises the following steps: dividing the phosphate layer in a mining section into several stages from bottom to top along the inclination, constructing a stage transport main in the lower part of each stage, and using the stage transport main of the previous stage as the stage auxiliary transport main of the next stage without leaving a bottom pillar and a top pillar; constructing an air return crosscut in the upper part of the uppermost stage from the air shaft, and then excavating an air return shaft from the air return crosscut downward along the inclination of the phosphate layer to connect with the stage auxiliary transport main and the stage transport main; arranging strip blocks along the strike on both wings of the stage to perform skip mining, first mining the odd strip blocks and filling them, and then mining the even strip blocks, the size of the strip blocks being determined according to the strength of the roof and floor, and no inter-pillar being left between the strip blocks; and thus mining all the stages from bottom to top. The present application greatly reduces the leaving of pillars and improves the resource recovery rate of one stoping.